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Finding and selecting XML nodes using XSL patterns.  The Xql package
implements the pattern matching of the July 1999, W3C XSLT draft.  It
provides a simple API to find XML nodes.

<p>To find the first table with an image at any
depth beneath the source node:

<code><pre>
Node found = Xql.find(".//table[.//img]", node);
</pre></code>

<p>Or to select all tables in all sections below the current node:

<code><pre>
Iterator iter = Xql.select("section/table", node);
</pre></code>

<p>Patterns can also be compiled.
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